Are you kidding?! Again a similar situation to yours of carelessness. I live next to close to Canadian border and most Canadian live close to their southern border. I ride all winter long when ridership drops down by a factor 100-300. My bikes are stored in an unheated garage. My riding temperatures span so far -30C to 43C. The latter have been typical daily temperatures at my base in Asia and in Africa close to that. No blowouts for me or anybody else tied to those temperatures. For tires that you use in touring, it is common to have kevlar beads rather than wire, so that you can fold them easier for your luggage.
I think that's the thing. If you are riding them in winter you are keeping them inflated and I think it's when they are cold and uninflated that it's possible to get cracks. But maybe I'm wrong? I know I used to take them for granted over the winter but I don't anymore. I'm not using my bike everyday for transportation like I think a lot of the people in this thread are. For me it's when I get a weekend off work and I want to take a short couple hundred km trip somewhere. Or I am traveling to the next city for a BMX race or cruise around town with some buddies. The possible down time will cost me way more then it's worth.
It might be a surprise but I also do collect and restore vintage bikes. I've noticed that sometimes a pull a tube out of a old wheel and it still smells good, but sometimes they smell awful and I believe it's the rubber breaking down.